Valve seat grinder



Sept. 4, 19,34. R. w. cATcHlNG 1,972,761

VALVE SEAT GRINDER Filed Sept. 25, 1933 3 Sheets-Sheet. l

INVENTOR Catching,

Sept. 4, 1934. R. w. cATcHxNG VALVE SEAT GRINDER Filed Sept. 25, 1935 5 Sheets-Sheet 2 INVENTOR lllejcafcm' BY y ATTORNEYS WITNESS n Sept. 4, 1934. R. w. cATcHlNG 1,972,761

' VALVE SEAT GRINDER Filed Sept. 25, 1955 3 Sheets-Sheet 3 L' i WAI i M ATTORNE WITNESS I Patented Sept. 4, 1934 1,972,761 VALVE A, SEAT ,GRINDER Roy W. Catching, Roseburg, Oreg. Application september 25,1933, serial No. 690,887

7 Claims.

This invention relates to a valve seat grinder. An object of the invention is the provision of a valve seat grinder which is adapted to be rotatably and entirely supported upon a pilot dis- 5 posed within a valve stem guide of an engine cylinder with a micrometer screw engaging the top of the pilot for retaining the grinder in a predetermined position so that the rotary grinder will properly engage the valve seat.

Another object of the invention is the provision of a valve seat grinder which is entirely supported upon a pilot mounted in a valve stem guide, with the body of the grinder, together with an airdriven motor, being revolved around the pilot while the grinding wheel per se is' driven by an air motor. Y

A further object of the invention is the provision of a valve seat grinder having a body portion rotatably mounted on a hollow handle which 20 supplies air to an air motor forming a unit with the body, the body member being centered with respect to the valve seat by a pilot secured in a valve stem guide of an engine cylinder with manual means for rotating the bodyand likewise the air motor around the pilot, the body and grinder being maintained atv a predetermined elevation by a micrometer screw having one end resting upon the top of the pilot, the air motor and shaft driven by motor being adjustable laterally oi the pilot and likewise the body to compensate for various diameters of valve seats.

A still further object of the invention is the provision of a valve seat grinder having a body to which is connected an air motor forming a unit with the bodysaid body being rotatably mounted on a hollow handle which is connected with a source of compressed air forv driving the motor, means being employed in the handle for maintaining a predetermined pressure of air in the air motor so that the air motor and `likewise the grinder will be driven lat a uniform speed during the grinding operation.

This invention will be best understood from a consideration of the following detailed description, in View of the accompanying drawings form-r t. Figure 2 is a similar view with parts lin secion, y Figure 3 is a horizontal section taken along the line 3 3 of Figure 2,

i Figure 4 is a fragmentary vertical vsection 50 through the lower half showing the interior of the air motor, 4 l

Figure 5 is a fragmentary vertical section taken along the line 5 5 of Figure 2,

Figure 6 is a horizontal section` taken along 65 the line 6 6 of Figure 1, v

Figure 7 is a horizontal section taken along the line 7 7 of Figure 1, Y

Figure 8 is a View in elevation of a modified form of the valve seat grinder, and

Figure 9 is a view invelevation, partly in section, of a modified form of the micrometer screw. Referring more particularly to the drawings, 10 designates generally a handlehaving a bracket portion 11 and an arm-12. The bracket por- 75 tion is provided with a bearing 13 which receives the upper end of a body member 14.k This body member is provided with a shoulder 1,5 which engages the underface of the bracket 11. A nut 16 is threaded onto the upper end of the body 30 member 14 for securing the bracket to the body member and preventing the loss of air past this point as will be presently explained. A set screw 17 secures the nut against release.

The body member has a vertical axial passage S5 20 which is adapted to receive'a pilot 21 secured in any approved manner within the valve stern guide 22 of an internal combustionengine 23. l

A-sleeve 25 is mounted in the axial bore 20 of the body 14V and is held in' place by means of a 90 set screw 26 threaded into a passage 27 in a bearing 28 formed' at the outer end ofthe arm 12. A micrometer screw 30 is threaded at'31 into the Vupper end -of the sleeve 25v and extends downwardly through the sleeve andterminates in'a 95 head 32 which is adapted to engage the upper end'of the pilot 21 for supporting the body member 14 at a predetermined height with respect to the valve seat 33j A collar '34 is secured at .35 to thev screw 30 so that when the collar'is re- 100 volved the screw will be revolved for properly'positioning the`head-32 so' that a rotary grinding element 36will properly -rengage the 'valve seat 33. A projection 37 extends outwardly of the coliar 34 and is formed integrally with the screw `105 30 so that the screw may be held againstV rotation in order to remove the collar 34 when desired. Y l

A journal sleeve 40 for a shaft 41 is rigidly connected with an arm 42 which in turn is formed 7110 integrally with a sliding block 43. This block is mounted in guides 44 which is formed integrally with an enlargement 45 formed on the body member 14. The block is provided with an elongated slot 45 and screws 47 are threaded into the enlargement 45. This arrangement provides for the lateral adjustment of the block 43 in the guides 44 so that the grinding element 36 may be properly positioned with respect to the valve seat 33; The lateral adjustment of lthe grinding element 36 permits the grinding to be employed in connection with valve seats of various diameters.

Referring more particularly to Fig. 4, it will be seen that the shaft 41 is supported by a thrust bearing formed in a collar 51 which is threaded onto the lov-.fer end of the sleeve 40. The grinding elen'ient 36 is secured to vthe reduced end 52 of the shaft 41. The upper end of the-shaft is mounted in bearings 53 formed in a` boss 54 of ahousing55 for an air motor generally indicated by the numeral 56. A

This air motoris provided with a plurality of semi-circular vanes 57 which are acted on by compressed'air passing through passages 58 and 59 and these passages are in communication with a passage 60. All of the passages are formed in a headll which is integral with the sleeve 40. The housing 55 is cup-.shaped and is threaded onto the headgl. v A plurality of discharge passages 62 are Vformed in the housing 55 to permit the escape of air and there is a passage for each vane 57.

A nipple 65 is in communication with the passage 60 and alnexiblehose 66 which extends upwardly and is connected at 67 with a passage 68 in the body memberA 14. l, An annular groovep69 is formed in the body member 14 between the shoulder 1 5V and the nut .16 andthis groove is not only in communication with the passage 68 but with a passage 70 formed in the handle 10.

The handle also includes a barrel 71 in which is mounted a piston 72 and this piston includes a non-metallic cup 73 held in place by a nut 74 threaded onto a reduced end 75 of a piston rod v76. A spring 77 engages a cap 78 on one end of the barrel and also the upper face of the piston 72. A spring 79 engages the nut 74 at one end and a shoulder 30 on the lower end of a sleeve The sleeve is provided with a plurality of passages 82 which areradapted to align with pas sages 83 formedy in the reduced lower end of the piston rod 76 with the sleeve being slidably mounted on vthe piston.

The rod is'providedwith a central passage 84 l which is connected at 85 with a sourcerof com- 'pressedV air. The lower end oi the sleeve is closed, asshown at 85 and is provided with anaXial passage 37. The lower end of the sleeve rests upon a pressure plate 88 having passages 89 which are in communication with the valve chamber 90 in the lower portion of the barrel 71. A screen 91 is held upon a seat by means of the pressure plate-88 which is cup-shaped and eX- tends above the inlet port to the passage 70.

A toothed'wheel or gear 92 is secured to the body membery l4nbelow the bracket 11 and a sprocket wheel 93 secured to a crank 94 and supported on theY bracket 11 is adapted to revolve the gear 92 land likewise the barrel 14 so that the grinding-element 36 is carried `through a circle around the pilot 2l and in engagement with the valve'seat 33. 1 Y

A screwlloo is threaded at 101 into the enlargement 45 of the barrel 14 and is adapted to support a truing member (not shown) for the grinding wheel 36.

In the modified form shown in Figs. 8 and 9 a micrometer screw 30 is provided with a yoke which receives the housing 55a of the air motor. In this instance the bearing sleeve 40 of the shaft 4l is located in a vertical position and in parallel relation with the pilot 2l wheren as, the sleeve 40 in the shaft 4l of the air motor illustrated in Figs. 1 to 7, inclusive, is disposed at an acute angle to the pilot. It will be noted that the body member is cut away at 106 adjacent the yoke 105 to permit the housing 55a to be located in the propel' vertical position. The body member is further cut away at 107 to receive a disc 108 secured to the lower portion of the yoke 105 by means of a screw 109 and this disc is received within a slot 107 of the body member for centering the micrometer screw 30.

l It will be noted that the micrometer screw at its lower end is reduced, as shown at 119, and threaded to receive a nut 111 which` is located within a pocket 11,2 formed in the yoke 105. ,Y

The grinding element 36 contacts withl the valve seat 33 to grind the seat away at the proper angle.

This form of the device may ,beused on all of the valve seats but is particularly adaptedA to grind the Valve seat adjacent the dash in view of thelimited space at this point.

The sprocket 93 is formed integrally `with a hollow shaft 93a mounted upon a bearing or axle 94a formed integrally with the body mem.- ber 14. AA headed bolt 92a retains the sleeve and likewise the integrally formed crank 94 in position on the axle 9421. It will be noted that the crank is formed integrally with the sleeve 9351.y

The operaion of my device is as follows: The

pilot 21 is placed in the valve stem guide 22 of f an engine cylinder and the body member 14 is disposed on the pilot 21 by means of the axial passage 2 0. The screw 25 is released, permitting the. sleeve 25 and the micrometer screw 30 to be raised or lowered as the case may be until the grinding element 36 engages the valve seat. Thescrew 26 is then tightened and the microme* ter screw is operated through the collar 34 to Vmaintainthe proper contact between the grinding element 36 and the valve seat 33. It will be seen from thisconstruction that the micrometer screw supports the body member on the pilot While the pilot merely actsas a shaft or axle for the rotation of the body member 14 and for the proper centering of the body member with ployed with valve seats ,ofV different diameters.`

The usual compressed air supply at a vgarage maybe employed for driving the air motor by connecting the hose of the compressed air supply With the member 85.

The grinding element being ymerely revolved the crank 94 is revolved,.causing the body member to be revolved on the pilot 21 and the grinding element as a unit to be revolved with the bodymember so Vthat the grinding elementV 36 Will engage the entire circumference of the, valve seat 33. When necessary the collar 34 may again be revolved through a slight angle because of its micrometer adjustment for causing the grinding element to be moved downwardly and give the proper angle of inclination of the valve seat 33.

Referring more particularly to Fig. 2, it will be seen that the air enters the passage 84 in the piston rod '76 and since the openings 83 and 82 are in alignment air will pass into the chamber 90 and then through the openings 89 through the dust screen 91 and into the passage 70 where it will flow to the air motor through the various connect-ed passages. The spring 77 is of such character that it will resist the upward movement of the piston 72 until the air pressure in the chamber 90 increases beyond a predetermined degree when the piston will be moved upwardly and the air ports 83 will be moved out of alignment with the air ports 82 in the valve sleeve 81. Thus it will be seen that the valve sleeve not only controls the flow of air to the air motor but tends to maintain a predetermined pressure of air in the motor for uniform operation.

Since the spring 79 tends at all times to maintain the closed end of the sleeve in engagement with the pressure plate 88, the sleeve will be held in a downward position as the piston moves upwardly to permit closing of the ports 82 by the reduced lower end of the piston rod 76.

I claim:

l. A tool for grinding valve seats for automobile engines comprising a body member, means for rotatably mounting the body member on a valve stem guide of an engine cylinder, a handle portion in which the body member is rotatably mounted, co-operating means on the body member and handle portion for causing rotation of the body member on the handle portion, a rotary grinder mounted in eccentric relation to the axis of the rotation of the body member, a micrometer screw located in the axis of rotation of the body member and adapted to support the body member at a predetermined position relative to the valve seat, a shaft connected to the rotary grinder and disposed at an acute angle to the axis of rotation of the body member, and means for rotating the shaft.

2. A tool for grinding valve seats for automobile engines comprising a body member, means for rotatably mounting the body member on a valve stem guide of an engine cylinder, a handle portion in which the body member is rotatably mounted, co-operating means on the body member and handle portion for causing rotation of the body member on the handle portion, a rotary grinder mounted in eccentric relation to the axis of rotation of the body member, a micrometer screw located in the axis of rotation of the body member and adapted to support the body member at a predetermined position relative to the valve seat, an air motor directly connected with the rotary grinder and mounted on the body member as a unit with said member.

3. A tool for grinding valve seats for automobile engines comprising a body member, means for rotatably mounting the body member on a valve stem guide of an engine cylinder, a handle portion in which the body member is rotatably mounted, co-operating means on the body member and handle portion for causing rotation of the body member on the handle portion, a rotary grinder mounted in eccentric relation to the axis of rotation of the body member, a micrometer screw located in the axis of rotation of the body member and adapted to support the body member at a predetermined position relative to the valve seat, a shaft connected to the rotary grinder and disposed at an acute angle to the axis of rotation of the body member, means for rotating the shaft, and means providing for lateral adjustment of the shaft on the body member.

4. A tool for grinding valve seats for automobile engines comprising a body member, means for rotatably mounting the body member on the valve stem guide of an engine cylinder, a handle portion in which the body member is rotatably mounted, co-operating means on the body member and handle portion for causing rotation of the body member on the handle portion, a rotary grinder mounted in eccentric relation to the axis of rotation of the body member, a micrometer screw located in the axis of rotation of the body member and adapted to support the body member at a predetermined position relative to the valve seat, an air motor directly connected with the rotary grinder mounted on the body member and forming a unit with said body member, the handle having an air passage therethrough, said air passage connected between a source of compressed air and the motor, and means in the handle for maintaining a predetermined air pressure in the passage.

5. A tool for grinding valve seats for automobile engines comprising a body member, means for rotatably mounting the body member on a valve stem guide of an engine cylinder, a handle portion in which the body member is rotatably mounted. co-operating means on the body member and handle portion for causing rotation of the body member on the handle portion, a rotary grinder, means for mounting the rotary grinder in spaced relation with the axis of rotation of Y bile engines comprising a body member, means for rotatably mounting the body member, a valve grinder mounted for rotation on the body member and including a shaft, a grinding element on one end of the shaft and an air motor for rotating the shaft, means for manually rotating the body member and the valve grinder as a unit about the vertical axis of the body member, and an air controlling means for the air motor receiving the body member and adapted to be held stationary while the body member is re- Volved.

7. A tool for grinding valve seats for automobile engines comprising a body member, means for rotatably mounting the body member, a valve grinder mounted for rotation on the body member and includinga shaft, a grinding element on one end of the shaft and an air motorv for rotating the shaft, means for-manually rotating the body member and the valve grinder as a unit about the vertical axis of the body member, a 

